作为最重要的半导体材料，硅在微电子等领域具有不可替代的作用。
As the most important semiconductor material, silicon is playing a very important role in microelectronics field.
精神传统是社会文化的重要组成部分，对于维系社会正常运转具有不可替代的作用。
Modern spiritual tradition is an important part of social culture, for it plays an irreplaceable role in maintaining the normal operation of our society.
内燃机作为二十世纪最广泛应用的动力机械，在新世纪中仍然具有不可替代的作用。
Internal combustion engine as most popular power machinery still has an affect in a new era.
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